House Calls: A house call occurs when your account worth falls below your firm's house requirement (see below). A representative from your firm may attempt to notify you by phone or e-mail in such instances; hence the "call." Depending on the severity of the call, you may be required to deposit additional funds into your account or to liquidate positions to meet the house call. Your firm may disregard small house call amounts. House Requirement (Maintenance Requirement): The account maintenance requirement as defined by your firm's house requirements are generally higher than those of the NASD. Your firm's maintenance requirements are normally listed in the Standard Margin Account Initial and Maintenance Requirement table and margin exceptions. Note : A House Call is different from an Exchange Call or a Fed Call.